Anonymous wrote:Or backup from lint from the washing machine. No big deal, get it snaked and measure how far out. Generally your basement drain is not a main drain and ties into the main sewer line further out.
We have had this problem a couple of times, and the lint from the washer does seem to be one culprit. Our washer and garbage disposal lines empty into the floor drain and what backs up/ out is black, kind of smelly, decomposing food waste. We have learned that those stickers that come on fruit do not decompose at all. They come out perfectly intact in the middle of the sludge. We get the drain snaked whenever we have a plumber around for other stuff--every 2 or 3 years.